Patents by Inventor Yoshinari Makimura

Yoshinari Makimura has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210020900
    Abstract: A non-aqueous electrolyte secondary battery that has a low initial resistance and an increase in resistance after charging and discharging is suppressed. The secondary battery includes a positive electrode, a negative electrode, and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer, which contains a lithium composite oxide having a layered structure. The lithium composite oxide is a porous particle. A surface of the porous particle includes a layer having a rock salt type structure. A thickness of the layer is not less than 5 nm and not more than 80 nm. A void ratio of the porous particle is not less than 15% and not more than 48%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle includes a coating of lithium tungstate.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 21, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Yuji YAMAMOTO, Momoko PROCTER, Yoshinari MAKIMURA, Tetsutaro HAYASHI, Willy Shun Kai Bong
  • Publication number: 20210020901
    Abstract: Provided is a nonaqueous electrolyte secondary battery with a positive electrode active material that contains an excess of Li and has a layered structure, the nonaqueous electrolyte secondary battery having a high output and enabling prevention of gelation of the positive electrode active material layer-forming paste during production. The herein disclosed nonaqueous electrolyte secondary battery includes a positive electrode, a negative electrode, and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer. The positive electrode active material layer contains a lithium composite oxide having a layered structure as a positive electrode active material. The compositional ratio of the lithium atom to the metal atom other than a lithium atom contained in the lithium composite oxide is greater than 1. The lithium composite oxide is in the form of porous particles.
    Type: Application
    Filed: July 15, 2020
    Publication date: January 21, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Yuji Yamamoto, Momoko Procter, Yoshinari Makimura, Tetsutaro Hayashi, Willy Shun Kai Bong
  • Publication number: 20210020922
    Abstract: A non-aqueous electrolyte secondary battery which is obtained using a lithium composite oxide having a layered structure and coated with a tungsten-containing compound in a positive electrode active substance, and which has a low initial resistance, and in which an increase in resistance following repeated charging and discharging is suppressed. The non-aqueous electrolyte secondary battery includes a positive electrode, a negative electrode and a non-aqueous electrolyte. The positive electrode includes a positive electrode active substance layer containing a lithium composite oxide having a layered structure. The lithium composite oxide includes a porous particle having a void ratio of not less than 20% but not more than 50%. The porous particle contains two or more voids having diameters that are at least 10% of the particle diameter of the porous particle. The surface of the porous particle is provided with a coating containing tungsten oxide and lithium tungstate.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 21, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Sumitomo Metal Mining Co., Ltd.
    Inventors: Yuji YAMAMOTO, Momoko PROCTER, Yoshinari MAKIMURA, Tetsutaro HAYASHI, Willy Shun Kai Bong
  • Publication number: 20210020923
    Abstract: A non-aqueous electrolyte secondary battery is obtained using a lithium composite oxide having a layered structure in a positive electrode active substance. An increase in resistance following repeated charging and discharging is suppressed. The battery includes a positive electrode provided with a positive electrode active substance layer, a negative electrode and a non-aqueous electrolyte. The positive electrode active substance layer contains a porous particle lithium composite oxide having a layered structure. The average void ratio of the porous particle is not less than 12% but not more than 50%, and it contains two or more voids having diameters that are at least 8% of its particle diameter. The surface of the porous particle is provided with a coating of lithium tungstate. The coverage ratio of the surface of the porous particle by the lithium tungstate is not less than 10% but not more than 65%.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 21, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, Sumitomo Metal Mining Co., Ltd.
    Inventors: Yuji YAMAMOTO, Momoko PROCTER, Yoshinari MAKIMURA, Tetsutaro HAYASHI, Willy Shun Kai Bong
  • Publication number: 20210020924
    Abstract: A nonaqueous electrolyte secondary battery uses, as a positive electrode active material, a lithium composite oxide having a layered structure and coated with lithium tungstate, and has a low resistance. The nonaqueous electrolyte secondary battery includes positive and negative electrodes and a nonaqueous electrolyte. The positive electrode includes a positive electrode active material layer containing a lithium composite oxide having a layered structure as a positive electrode active material. The lithium composite oxide is in the form of porous particles, each having at least two voids each having a percentage of a void area with respect to the area occupied by each of the particles in its cross-sectional view of at least 1%. Each porous particle has a void connecting the particle interior to the surface and having an opening with a diameter of at least 100 nm. Each porous particle has a lithium tungstate coating on its surface.
    Type: Application
    Filed: July 10, 2020
    Publication date: January 21, 2021
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, SUMITOMO METAL MINING CO., LTD.
    Inventors: Yuji YAMAMOTO, Momoko PROCTER, Yoshinari MAKIMURA, Tetsutaro HAYASHI, Willy Shun Kai BONG
  • Publication number: 20210020925
    Abstract: The present disclosure can bring excellent output characteristics to a nonaqueous electrolyte secondary battery that uses a cathode active material containing tungsten while desired durability is secured. The battery of the present disclosure includes a cathode, an anode, and a nonaqueous electrolyte. The cathode includes a cathode active material layer that contains a granular cathode active material. The cathode active material includes a core part that contains a lithium-transition metal composite oxide of a layered structure; a tungsten-concentrated layer that is formed over a surface of the core part and has a higher tungsten concentration than in the core part; and a lithium-tungsten compound particle that adheres to at least part of a surface of the tungsten-concentrated layer and contains tungsten and lithium. In the battery of the present disclosure, the tungsten-concentrated layer has an amorphous structure. This can bring excellent output characteristics while desired durability is secured.
    Type: Application
    Filed: July 16, 2020
    Publication date: January 21, 2021
    Applicants: Toyota Jidosha Kabushiki Kaisha, Sumitomo Metal Mining Co., Ltd.
    Inventors: Yuji Yamamoto, Momoko Procter, Yoshinari Makimura, Tetsutaro Hayashi, Willy Shun Kai Bong
  • Publication number: 20200287204
    Abstract: A negative electrode active substance material used for an electricity storage device of the present disclosure includes a silicon phase and a silicide phase represented by a basic composition formula MSi2, where M is one or more of Cr, Ti, Zr, Nb, Mo, and Hf. The negative electrode active substance material may have a structure in which the silicide phase is dispersed in the silicon phase.
    Type: Application
    Filed: February 28, 2020
    Publication date: September 10, 2020
    Inventors: Hiroyuki KAWAURA, Yasuhito KONDO, Yoshinari MAKIMURA, Tetsuya WASEDA, Masaki ADACHI, Jun YOSHIDA, Hiroyuki YAMAGUCHI
  • Publication number: 20200044252
    Abstract: When spinel-type lithiated cobalt oxide is employed for a cathode active material for a lithium ion battery, a sufficient discharge capacity is not always obtained. Thus, spinel-type lithiated cobalt oxide is doped with at least chromium, and specifically, a cathode active material for a lithium ion battery includes a spinel-type crystal phase including lithium, cobalt, chromium and oxygen, and the cathode active material has a composition represented by LiCoxCryMzO2±? where M is at least one selected from Al and Mn, and 0.85?x<1, 0<y?0.15, 0?z, and 0.85<x+y+z?1.
    Type: Application
    Filed: June 10, 2019
    Publication date: February 6, 2020
    Applicant: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yuhki Yui, Yoshinari Makimura
  • Publication number: 20190319271
    Abstract: A positive electrode active material contains at least: fluorine in an amount not lower than 0.08 mass %; carbon in an amount not lower than 0.02 mass %; and lithium-metal composite oxide particles making up the remainder. The lithium-metal composite oxide particles contain nickel in an amount not lower than 60 mol % of the total amount of metallic elements. At least a partial amount of each of the fluorine and the carbon is present on surfaces of the lithium-metal composite oxide particles.
    Type: Application
    Filed: March 13, 2019
    Publication date: October 17, 2019
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Kunimitsu YAMAMOTO, Yoshinari MAKIMURA
  • Publication number: 20190181442
    Abstract: When spinel-type lithium cobaltate is applied as cathode active material for a lithium ion battery, a spinel-type crystal phase is unstable and is easy to be dislocated to a layered rock-salt structure, which makes it easy to impair battery properties. Thus, manganese is partially substituted for cobalt in spinel-type lithium cobaltate, to achieve stabilization of the spinel-type crystal phase. Specifically, cathode active material is used in a lithium ion battery, the cathode active material including: a composite oxide of lithium and transition metal, wherein the transition metal consists of cobalt as a main constituent, and manganese, and the composite oxide has a spinel-type crystal phase that is formed of lithium, cobalt, manganese, and oxygen.
    Type: Application
    Filed: December 3, 2018
    Publication date: June 13, 2019
    Applicants: TOYOTA JIDOSHA KABUSHIKI KAISHA, KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Keita NIITANI, Yoshinari MAKIMURA
  • Patent number: 9515312
    Abstract: A lithium secondary battery (10) includes a positive electrode active material of lithium transition metal oxide which contains at least a nickel element and a manganese element as transition metals and for which, with respect to a diffraction peak A located at a diffraction angle 20 of 17° to 20° and a diffraction peak B located at a diffraction angle 2? of 43° to 46° from X-ray diffraction measurements, when the integrated intensity ratio is R1=IA/IB, the peak intensity ratio is RH=HA/HB, and the ratio between the integrated intensity ratio R1 and the peak intensity ratio RH is SF=RH/R1>> the SF satisfies 1.1?SF?2.2.
    Type: Grant
    Filed: December 21, 2012
    Date of Patent: December 6, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Yoshinari Makimura, Tetsuro Kobayashi, Hiroki Nagai
  • Publication number: 20160172673
    Abstract: Provided is a cathode active material for a non-aqueous electrolyte secondary battery, with which it is possible to improve the output characteristics during use in extremely low-temperature environments. A lithium compound is mixed with nickel cobalt manganese composite hydroxide particles that are expressed by the general formula: NixCoyMnzMt(OH)2+a (where x+y+z+t=1, 0.30?×?0.70, 0.10 ?y?0.40, 0.10 ?z?0.40, 0?t?0.01, and M is one or more elements selected from Mg, Ca, Al, Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, and W) such that the ratio of the number of lithium atoms to the total number of atoms of metal elements other than lithium is 1:0.95 to 1.20. The lithium mixture undergoes calcination in an oxidizing atmosphere so that the rate of temperature rise in a temperature range of at least 30° C. to 800° C. is 4° C. /min to 10° C./min, the calcination temperature is 800° C. to 1000° C.
    Type: Application
    Filed: July 22, 2014
    Publication date: June 16, 2016
    Applicants: SUMITOMO METAL MINING CO., LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Hiroyuki TOYA, Masahiro MORITA, Hiroki NAGAI, Yoshinari MAKIMURA, Tetsuro KOBAYASHI
  • Publication number: 20150010821
    Abstract: A lithium secondary battery (10) includes a positive electrode active material of lithium transition metal oxide which contains at least a nickel element and a manganese element as transition metals and for which, with respect to a diffraction peak A located at a diffraction angle 20 of 17° to 20° and a diffraction peak B located at a diffraction angle 2? of 43° to 46° from X-ray diffraction measurements, when the integrated intensity ratio is R1=IA/IB, the peak intensity ratio is RH=HA/HB, and the ratio between the integrated intensity ratio R1 and the peak intensity ratio RH is SF=RH/R1>> the SF satisfies 1.1?SF?2.2.
    Type: Application
    Filed: December 21, 2012
    Publication date: January 8, 2015
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Yoshinari Makimura, Tetsuro Kobayashi, Hiroki Nagai
  • Publication number: 20110143205
    Abstract: A coin type battery 20 is provided with a cup-shaped battery case 21, a positive electrode 22 disposed in the inside of this battery case 21, a negative electrode 23 disposed at a location opposite to the positive electrode 22 with a separator 24 therebetween, a nonaqueous electrolytic solution 27 containing a supporting electrolyte, a gasket 25 formed from an insulating material, and an opening-sealing plate 26, which is disposed at an opening portion of the battery case 21 and which seals the battery case 21 with the gasket 25 therebetween. Here, the negative electrode 23 includes an oxide represented by a basic composition LiNi1-xMnxO2 (0<x<0.5) as a negative electrode active material. It is preferable that the valence of Ni contained in the oxide is 2 and 3, and the valence of Mn is 4.
    Type: Application
    Filed: December 13, 2010
    Publication date: June 16, 2011
    Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHO
    Inventors: Yoshinari MAKIMURA, Takao INOUE, Yoji TAKEUCHI
  • Publication number: 20080153002
    Abstract: A compound having the formula LiaNa2?aFePO4F, wherein 0<a?2 may be synthesized by exchanging lithium ions for sodium ions in Na2FePO4F. The compound may be used as a cathode material for a lithium ion battery. A battery may be comprised of an electrode active material having the formula Li2FePO4F, an anode; and an electrolyte. Na2FePO4F may be synthesized by flux reaction. Microcrystalline Na2FePO4F may be synthesized by a solution method. Na2FePO4F may be used as a cathode material for a lithium ion battery and may be carbon composite coated.
    Type: Application
    Filed: November 27, 2007
    Publication date: June 26, 2008
    Inventors: Linda Faye NAZAR, Michael Makahnouk, Brian Ellis, Kathryn Toghill, Yoshinari Makimura